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She also opens up about the miscarriage kept secret from the public until Jay-Z referred to it in his song Glory, released after their daughter's birth.

In the documentary, Beyonce touched on the topic briefly, saying, 'It was the saddest thing I've ever been through.'

'My life is a journey. ... I had to
go through my miscarriage, I believe I had to go through owning my
company and managing myself ... ultimately your independence comes from
knowing who you are and you being happy with yourself,' she said.

This is our moment: the loved up couple serenade each other soon after finding out the star is pregnant

Touching: the scene in the bar where the couple sing to each other is the most touching moment in the film

Beyonce told Oprah Winfrey that she gained a whopping 60 pounds while pregnant with Blue.

The
singer sat down with the television mogul for Oprah's Next Chapter to
discuss the documentary, revealing that she got a shock when preparing
to do a show just three months after Blue arrived.

'I did a show three months after giving birth, which was crazy,' she says in a clip from the forthcoming interview.

'I had clearly never given birth, and I didn't know that I would gain 60 pounds - 57 pounds,' she laughs.

Missing piece: Her daughter Blue Ivy helped her see connections in her documentary Life Is But A Dream

The singer also talks candidly about her relationship with her husband Jay-Z, and their possible plans to have more children.

The couple married in 2008 but have been notoriously tight-lipped about their relationship.

Since the birth of their first child, Beyonce has slowly opened up about her home life.

In a more light-hearted moment, Winfrey asks: 'When you get to the point when you can say, on camera, "I'm going to make love to my husband... How big is the Carter family going to expand to?'

Female bonding: Beyonce's exclusive interview with Oprah Winfrey aired on Saturday, the same night as her new documentary on HBO, Life Is But A Dream

The superstar is also coming out with a new album this year, and the Mrs Carter Show World Tour - Jay-Z's real name is Shawn Carter.

The tour will kick off in April with more than 40 performances in Europe and North America.

It was announced today that Beyonce Knowles and her rapper husband Jay Z have been honoured as the Power Couple of 2013.

They beat 24 other couples to the title in the E! News poll, including Prince William and Duchess Catherine, who are on the second spot, and Kanye West and Kim Kardashian, who occupy the third place.

Life is but a dream: All is going well in Beyonce's world now, she said to Oprah in an exclusive interview that motherhood is her greatest achievement